Swab



. ferent kinds ofI packing.

Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE 1,1* HARVEY R.STANDLEE, OF TULSA, OKLAHOMA, ASSIGNOR OF ONE-FOURTH T0 :PAUL

` ARBON COMPANY, 0F TULSA, OKLAHOMA SWAB ' v.Applicationfiled May 15,

snugly lit against the interior wall of the casing regardless ofthepressure. `Another disadvantage of some presento day swabs is thefact that the rubber packing thereon not `only wears out quickly but isdifficult to replace. i

It is the purpose of my invention to create a swab which will `operateextremely satisfactory under a wide range of pressures and whichwillreduce wear upon its packing to a minimum. i

" I accomplish the above by .usingl two dif- My upper packingconsists ofcanvas or rubber orthe like and it is very stiff and the packing belowthis is rather liexible. The upper packing fits snugly againstthercasing and carries most of the pressure due to the column of fluid`which. `is abovel the swab. The fluid which leaks past the stiff upperpacking is carried by the flexible` packings there eneath.` The lowestpacking is not quite as flexible as the centrally situated packing.

Thus', the stiff upper packing rides against the casing and takes orcarries some of the pressure ofthe fluid above the swab which wouldotherwise press inwardly upon the flexible packing justbelow. Hence, thedif- `4.0 ference in pressure between the `inside and the outside Hofthe flexible packing is iiicreased with the result thatl very littlefluid will leakpast this flexible packing.

y The pressure is likewise held. ott of the 5 outside of the lowerflexible packing by both tion"the` expansible part oriparts should'1929. Serial No. 363,266.

the flexible packing thereabove and the stif packing. Thus thedifference in pressure between the inside and outside of this lastmentioned packing is even greater than that of the previously referredto packing and hence this lower packing cup is made slightly thicker andstiffer.

4 Another advantage which I obtain is the4 readiness with which the wornout rubber packing or the like may be renewed dueto the inner taper ofthe collars. i

Brieiiy described my invention consists of an integral hollow tubehaving a series of increasing diameters whereby all of the severalpacking and locking units may be successively placed on or removed fromits lower end. Obviously, my integral structure has a maximum ofstrength with the minimum of `material asv there, are no `jointswhatsoever. r Furthermore, it will be appreciated as the descriptionproceeds that the point of greatest strain is at the top of the vpacking unit and it is at thisu point that the hollowbody member is thethickest.

After the several packing units and their locking means are placed inposition upon the hollow body member my novel valve is threadedlyengaged at the bottom end thereof. This is a one-.way valve and itsstructure'is disclosed in my Patent 1,719,028, liled4 Aug. 26, 1926,entitled `Swab release mechanism. r

The upper end of the circular hole in the body member terminates in aslot` which passes through the wrench square and thus I utilize this`flat surface for two purposes. That is to say, by drilling this slotthrough the flat sides ofthe wrench 'square not only is the drillingoperation shortened but the path traveled by the fluid through the swabis shortened and rendered less toituous.

The body of the swab can be made shorter and no space other than thewrench square is required for the openings which permit the fluid topass from the interior to the exterior of the swab.

Other objects and advantages reside in the special construction,combination and arrangement of the various elements forming theinvention as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming part thereof, wherein;

The figure is a side View of my swab, parts being broken away in orderto facilitate the showing.

Similar numerals represent similar parts throu hout the several views.

VRe erring now to the drawing, numeral 10- indicates the main body Vormandrel of my swab. The main body or mandrel is preferably forged fromhigh grade steel and it has the usual tapered and threaded portion -11at its upper end, by which it is attached to the usual string of toolsas is well known to those skilled in this art.

A short distance below the threaded part -11- are formed flat surfacesl2- and 13 thereby furnishing an ordinary wrench square and a slot oropening #111- passes directly through the body from one flat surface tothe other.

The slot I4- connects with the hole -15- which runs longitudinally ofthe main body member. The hole 15eand the slot -14- provide a passagewayfor the fluid upwardly as the swab is gravitated downwardl into thewell.

A shoul er 1G- is formed just below the slot or opening -14- and acylindrical seat -'-17-,with a threaded portion -18-, is formed justbelow the shoulder. Thus, the impregnated canvas and rubber packing-20-, with the disc plate -21- as a follower, is held tightly againstthe shouldered ortion -16- by means of an ordinary ook nut -22-.

Just below the lock nut 22- the diameter of the body portion is reducedto form the surface -23- with a threaded portion 24 and an invertedcup-shaped member 2oformed of a bottom part -26-, with a hole therein,and a tapered flange Q7-1 is placed against the shoulder -28-. Anothersimilar oup member -25- is uprightly placed below the inverted cup mem`ber and thus a seat is formed for my flexible rubber aeking.

As s own, my packing consists of a bulged cylindrical shaped flexiblebody -30.-., preferably of rubber, and tapered end portions -3land -82-which snugly fit into the cups -25. Lock nuts 33- and *36P- arethreadedly engaged upon the threaded portion 24- and provide means forplacing the rubber packing 30- under compression as well as retaining itin place. Additional pressure is obtained on the inside of the packing-30--,

when under actual working conditions, by boring holes -35- through thebody just behind the bulged portion of the flexible packing. These holesallow the fluid to freely enter behind the packing and push it outwardlybut the stiff upper packinv hinders the fluid pressure from imme iatelyreaching the outer side of this flexible packing and hence a differencein pressure is obtained. This outwardly directed pressure maintains adesirable tight lit between the flexible packing and the casing.

A shoulder -40- is formed just below the threaded portion Q4- and cups-41- hold the rubber -42- in place and are in turn held in lace by thelock nuts 43- and 44- t readedly engaged upon the threaded portion 45-.A hole 46- allows the fluid to pass behind the rubber -4Q- and add toits outward pressure when in operation.

As previously set forth the stiff' packing prevents the fluid pressurefrom reaching the outside of the upper flexible packing and allows itonly on the inside thereby causing it to expand. Similarly, or rather inincreasing fashion, the stiff packing and the upper flexible packingbot-h tend to prevent fluid pressure from reaching the outside of thislower cup and hence its inner pressure causes it to press snugly againstthe walls of the casing in which 1t is being operated.

The threads -45- also provide means for holding the neck 51- of thevalve -50- rigid in place at the bottom of the mandrel or body part.This is a one-way valve and it allows the fluid to pass upwardly as theswab is being lowered into the well.

Although a particular embodiment of the invention has been illustratedand described in order to comply with the terms of the patent statutes,it is not intended that the invention shall be limited to saidparticular embodiment since the invention may be applied to other formswithout departing from its spirit.

I claim:

l. A swab consisting of a substantially cylindrical integral body ofsuccessively increasing diameters relative to one end thereof and asquared portion thereon near the other end; threaded portions on theseveral stepped portions adjacent the shoulders therebetween, extremelystiff acking on the portion closest to the s uare portion; means forholding or loc ing it in place; other packing on the adjacent portionand means to hold it in place.

2. A swab comprised of a body member having a hole therethrough, heavystiff packing encircling the swab near its top, flexible packingencircling the swab below its top, said body member having an openingleading from its interior hole to a CID CERTIFICATE 0F CORRECTIQN.

Patent No. 1,743,937. Granted January 14, 1930, to

HARVEY R. STANDLEE.

It is hereby certified that error appears in the printed specification`of the above numbered patent requiring correction as follows: Page 3,in claim 3, first line, for "claim 1" read "claim 2"; and that the saidLetters Patent should be read with this correction therein that the samemay conform to the record of the t case in the Patent Office.

Signed and sealed this 25th day of March, A. D. l1930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

